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Commit | Line | Data |
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59bbb6f7 JB |
1 | /* |
2 | * This file contains helper code to handle channel | |
3 | * settings and keeping track of what is possible at | |
4 | * any point in time. | |
5 | * | |
6 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
7 | */ | |
8 | ||
9 | #include <net/cfg80211.h> | |
10 | #include "core.h" | |
11 | ||
12 | struct ieee80211_channel * | |
13 | rdev_fixed_channel(struct cfg80211_registered_device *rdev, | |
14 | struct wireless_dev *for_wdev) | |
15 | { | |
16 | struct wireless_dev *wdev; | |
17 | struct ieee80211_channel *result = NULL; | |
18 | ||
19 | WARN_ON(!mutex_is_locked(&rdev->devlist_mtx)); | |
20 | ||
21 | list_for_each_entry(wdev, &rdev->netdev_list, list) { | |
22 | if (wdev == for_wdev) | |
23 | continue; | |
24 | ||
25 | /* | |
26 | * Lock manually to tell lockdep about allowed | |
27 | * nesting here if for_wdev->mtx is held already. | |
28 | * This is ok as it's all under the rdev devlist | |
29 | * mutex and as such can only be done once at any | |
30 | * given time. | |
31 | */ | |
32 | mutex_lock_nested(&wdev->mtx, SINGLE_DEPTH_NESTING); | |
33 | if (wdev->current_bss) | |
34 | result = wdev->current_bss->pub.channel; | |
35 | wdev_unlock(wdev); | |
36 | ||
37 | if (result) | |
38 | break; | |
39 | } | |
40 | ||
41 | return result; | |
42 | } | |
43 | ||
44 | int rdev_set_freq(struct cfg80211_registered_device *rdev, | |
4b181144 | 45 | struct wireless_dev *for_wdev, |
59bbb6f7 JB |
46 | int freq, enum nl80211_channel_type channel_type) |
47 | { | |
48 | struct ieee80211_channel *chan; | |
49 | struct ieee80211_sta_ht_cap *ht_cap; | |
50 | int result; | |
51 | ||
4b181144 | 52 | if (rdev_fixed_channel(rdev, for_wdev)) |
59bbb6f7 JB |
53 | return -EBUSY; |
54 | ||
55 | if (!rdev->ops->set_channel) | |
56 | return -EOPNOTSUPP; | |
57 | ||
58 | chan = ieee80211_get_channel(&rdev->wiphy, freq); | |
59 | ||
60 | /* Primary channel not allowed */ | |
61 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
62 | return -EINVAL; | |
63 | ||
64 | if (channel_type == NL80211_CHAN_HT40MINUS && | |
65 | chan->flags & IEEE80211_CHAN_NO_HT40MINUS) | |
66 | return -EINVAL; | |
67 | else if (channel_type == NL80211_CHAN_HT40PLUS && | |
68 | chan->flags & IEEE80211_CHAN_NO_HT40PLUS) | |
69 | return -EINVAL; | |
70 | ||
71 | ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap; | |
72 | ||
73 | if (channel_type != NL80211_CHAN_NO_HT) { | |
74 | if (!ht_cap->ht_supported) | |
75 | return -EINVAL; | |
76 | ||
77 | if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || | |
78 | ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) | |
79 | return -EINVAL; | |
80 | } | |
81 | ||
82 | result = rdev->ops->set_channel(&rdev->wiphy, chan, channel_type); | |
83 | if (result) | |
84 | return result; | |
85 | ||
86 | rdev->channel = chan; | |
87 | ||
88 | return 0; | |
89 | } |